WordNet (r) 3.0 (2006):
demagnetise v 1: erase (a magnetic storage device) [syn: demagnetize, demagnetise] 2: make nonmagnetic; take away the magnetic properties (of); "demagnetize the iron shavings"; "they degaussed the ship" [syn: demagnetize, demagnetise, degauss] [ant: magnetise, magnetize]